Maxxis Relix Dual Compound Silk Shield Folding Bead 170TPI Clincher Bicycle Tire The Relix uses Maxxis` lightest and most supple 170 TPI casing (ONE70) along with SilkShield puncture protection, which protects both the sidewalls and the underside of the tread DC - Dual Compound tread provides a lower rolling resistance center paired with extra grip for the corners SS - SilkShield offers bead to bead puncture protection covering the tread as well as the sidewalls Weight Model Number